Which ofthese is least likely to act as a Lewis base?

• CO

• F^-

• BF₃

• PF₃

682.

An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point 6.0), glutamic acid (3.2) and arginine (10.7) buffered at pH 6. What is the fate of the three acids?

• Glutamic acid migrates to anode at pH 6. Arginine is present as a cation and migrates to the cathode. Alanine in a dipolar ion remains uniformly distributed in solution

• Glutamic acid migrates to cathode and others remain uniformly distributed in solution

• All three remain uniformly distributed in solution

• All three move to cathode

If the molecular wt. of Na₂S₂O₃ and I₂ are M₁ and M₂ respectively then what will be the equivalent weight of Na₂S₂O₃ and I₂ in the following reaction?

2S₂O₃^2- + I₂ $\to$ S₄O₆^2- + 2I^-

• M₁ , M₂

• M₁ , M₂/2

• 2M₁ , M₂

• M₁ , 2M₂

The solubility of Ca₃(PO₄)₂ in water is y mol/L. Its solubility product is:

• 6y⁴

• 36y⁴

• 64y⁵

• 108y⁵

The equilibrium constant (K) of a reaction may be written as

• $\mathrm{K} = {\mathrm{e}}^{-∆\mathrm{G}/\mathrm{RT}}$

• $\mathrm{K} ={\mathrm{e}}^{-∆{\mathrm{G}}^{°}/\mathrm{RT}}$

• $\mathrm{K} = {\mathrm{e}}^{-∆\mathrm{H}/\mathrm{RT}}$

• $\mathrm{K} = {\mathrm{e}}^{-∆{\mathrm{H}}^{°}/\mathrm{RT}}$

$\mathrm{For} \mathrm{the} \mathrm{reaction} {\mathrm{SO}}_2 + \frac{1}{2}{\mathrm{O}}_2 \rightleftharpoons {\mathrm{SO}}_3 , \mathrm{if} \mathrm{we} \mathrm{write} {\mathrm{K}}_{\mathrm{p} }= {\mathrm{K}}_{\mathrm{c}}(\mathrm{RT}{)}^{\mathrm{x}}, \mathrm{then} \mathrm{x} \mathrm{become}$

• -1

• $-\frac{1}{2}$

• $\frac{1}{2}$

• 1

Which of the following will decrease the pH of  a 50 mL solution of 0.01 M HCl?

• Addition of 5 mL of 1 M HCl

• Addition of 50 mL of 0.01 M HCl

• Addition of 50 mL of 0.002 M HCl

• Addition of Mg

Under which of the following conditions is the relation $∆\mathrm{H} =∆\mathrm{E} + \mathrm{P}∆\mathrm{V}$ valid for a closed system ?

• Constant pressure

• Constant temperature

• Constant temperature and pressure

• Constant temperature, pressure and composition

For a reversible chemical reaction where the forward process is exothermic, which of the following statements is correct ?

• The backward reaction has higher activation energy than the forward reaction.

• The backward and the forward processes have the same activation energy.

• The backward reaction has lower activation energy

• No activation energy is required at all since energy is liberated in the process.

0.1M HCl and 0.1M H₂SO₄ each of volume 2 mL are mixed and the volume is made upto 6 mL by adding 2 mL of 0.01N NaCl solution. The pH of the resulting mixture is

• 1.17

• 1.0

• 0.3

• log 2 - log 3